Hobbing machine



July 10,1928. y

' C. H. SCHURR HOBBING' MACHINE Filed'nec. ff',v 192s 9 sheets-sheet 1gwvmfroz'g. ,MU A4 MW fluor nu# July l0, 1928.

c. H. sci-JRR HoBBING MACHINE Filed Dec. '1. 1925 9 sheets-sheet 2 gmmm@uw mu July l0, 1928i. 1,676,873

C. H. SCHURR HOBBING MACHINE Filed Dec. '7, 1923 9 Sheets-Sheei'l 3 I II l l l l. I

@Hoang July 1o, 1928.

c. H. scHuRR HOBBING MACHINE Filed Dec. 7, 1925 9 Sheets-Sheet 4gnou/tto@ atto: nu*

July l0, E928,

C. H. SCHURR HOBBING MACHINE Filed Deo. 7, 1923 9 Sheets-Sheet 5 Julyl0, 1928.

C. H. SCHURR HOBBING MACHINE Filed Deo. 7, 1925 9 Sheets-Sheet 6 61H0:Het:

Juy 10, 1928.

38B x l 38a l l l "Ml 1,676,873 c. H. SCHURR v HOBBING MACHINE 9Sheets-Sheet is Filed Dec. '7, 1923l Mu J( @M July 10, 1928.

C. H. SCHURR HOBBING MACHINE Filed neg. v, 1923 9 sheets-sheet o Char/f5/7/. Seba/"r .Patented .ly l, 1928.

i aras wie' esta i.

CHARLES H. SCHURR, F CLEVELAND', OHIQ, ASSIGNOR T0 THE LEES-BRADNERC0191- PNY, 0F CLEVELAND, OHIO, A CORPORATION IQEOBVBING MACHINE.

Application filed 'December 7, 1923. Serial No. 679,127.

This invention relates to machines for hobbing gears.

One object of the invention is to provide an improved mechanism forfeeding the work in either direction.

Another object of the invention is to provide relatively simple meansfor rotating the tool and Work-piece in correlation to each other.

Another object of the invention is to provide an improved mounting forthe tool, lwhereby it maybe adjusted to different operative positions.

Other objects of the invention will be apparent to those skilled in theart to which my invention relates from the following' description takenin connection with the accompanying drawings, wherein Fig. 1 is a topplan view of a bobbing machine embodying my invention.

Fig. 2 is an end elevation of the machine.

Fig. 3 is van end elevation opposite end of the machine.

Fig. 4 is a front elevation of the machine.

Fig 5 isa section on the line 5 5 of Figs. l and 7.

Fig. 6 is a section on the line 6-6 of Fig. 5.

Fig. 7 is a section on the line 7 7 of F ig. 5. l

Fie'.' 8 is a section on the line 8-8 of Fig.

Fig. 9 is a section on the line 9-9 of Fig. 5.

Fig. 10 is a section on the line 10-10 of Fig. 5.

Fig. 11 is a section on the line 11-11 of Fig. 4.

Fg. 12 isa schematic top view of my invention to show in simplified formthe arrangement of the parts therefor and to facilitate itsunderstanding.

Fig. 13 .is a side view of an annular member shown also in Fig. 5 andFig. 6E

Fig. 14 is a cross sectional view on vthe plane 14--14 of Fig. 5, thisvplane being the plane of the right hand face of the annular member asit appears in Fig. 5.

Fig. 15 is a side view of a collar shown also in Figs. 10 and 5.

ll4`i, r.1(.is a sectional view on the plane 16-16 of Fig. 5, hand faceVof the Fig. 5.

In the drawings, 1 indicates as an entirety collar 94 as it appears inlooking at the the plane lying in the leftor spindle 2, to be laterreferred to, is disposed vertically, or substantially vertically; but itWill be understood that the frame section and column may be arrangedsothat this shaft may be supported in any other desired position.

At one side, the frame section 1"L is provided With a base portion 3,having guides 4 for a slide 5. The slide 5 is'shaped to provide asupport for spaced bearings 6 in which is supported a spindle 7,carrying an arbor 7l and Work-piece A. The spindle 7 is held in positionby covers 8, bolted to the walls of the bearings 6 by cap screws 9. 10indicates a gear xed to the spindle 7 between the bearings (see dottedAlilies in Fig. 2). The gear 10 meshes with and is driven by aH pinion12 splined in any desired manne-r to a shaft 12a, to which referencewill later be made.

13, 14 indicate casing members, provided with hollow extensions 15,'16,respectively, to form housings and suitable bearings in which the shaft12-a rotates and in Which the pinion 12 rotates and slides Whilemaintained in mesh with the gear 10 during movement of the slide andgear 10 relative to the shaft 12a. The Work-piece A is mounted on theWork arbor 7a carried by the spindle 7 and held against ashoulderlformed by such reduced portion by a nut 17 (see Fig. 1). At 18the slide 5 is provided With suitable ways for a supplementalslide 19,which carries athrust arm or abutment 20. The arm o r abutment 2() isarranged to engage the work arbor 7a beyond the Workpiece A and on thatside remote. from the hob or tool .B. The Ways 18 preferably eX- tendparallel to the axis of the Work shaft. A suitable lock, indicated at21, may be provided to secure the supplemental slide 19 to the slide 5at the desired position; such lock having a member (notshown) lfittingthe slot 21a formed in the slide 5 and engaging the walls thereof when.the handle 211 1s turned. The supplemental slide 19 is preterablyadjusted on the slide 5 by a shaft 22,

25 indicates an arm depending from theA rear end of the slide 5 andformed with an opening 26 in Which fits one end of a .feed screw 27,such end being suitably keyed in the opening. The end of the screw 27 isreduced to form a shoulder 28, which is held against the inner face ofthe arm by a nut 29 screwed on the free end of the screw and engagingthe outer face of the arm 25.

30 indicates a supporting member shdably engaging suitable ways 30Llmounted on the frame 1. 'Tlfe member 3() extends upwardly to provide astandard 31 and a head 32. The head 32 is of annular shape, to permitashaft 33, to be later referred to, to extend through it and form abearing on which a housing 34 swivels for a purpose to be hereinafterdescribed. The housing 34 comprises a sleeve member 34a surrounding theshaft 33 and rotatably engaging the head 32, a main casing member 34"and a removable member 34". The main member 34" and removable member 34"are provided with bearings for the tool spindle 2 which extendstherethrough and carries at its free end the tool B. The bearings forthe spindle'2 are so arranged that a gear 36 (preferably a wormvgear)may be removably fixed to the spindle 2.

The main casing member 34" and sleeve member34a are shaped to enclosethe Worin gear 36 and a worm 37 splined on the shaft 33 and meshing withthe Worm gear 36 to drive it. One side wall of the casing mem ber 34" isprovided with an integral plate 38, which bears against the face 31n ot"the standard 31 and'is arranged to be adjustably fixed thereto, so thatthe housing or casing 34 may be swiveled on the head 32 to position thetool spindle 2 at any desired angle to the vertical. To permit of suchswiveling and adjustment, the. plate 38 and housing 34 carry bolts 38awhich slide in arc-shaped recesses or slots 38" formed in the standard3l. By tightening the bolts j 38, the heads thereof or washersinterposed between the heads and the standard 31, will engage the latterand thus secure the plate 38 to the standard in any positionofadjustment. A

Adjustment of the housing 34 and tool spindle 2 may be edected in anydesired manner. For illustrative purposes, provide on the side wall ofthe sleeve 34 a. worm Segment 32 with which meshes a Worm 32b fixed to ashaft 32". The shaft 32c is mounted in suitable bearings provided in thewall of thestandard 31. The free end of the shaft extends outwardly (seeFig. 11) and has a squared or other shaped end to adapt it to a toolwhereby it may be turned. lf the bolts 38"L are loosened and the shaft32, rotated, it will be seen that the housing 34 and shaft 2 may bemoved about lthe shaft 33 to any desired position.

36" indicates a suitable anti-triCtiOn thrust bearing interposed betweenthe lower end of the hub forthe gear 36 and the adjacent bearing,

The shaft 33 extends transversely of the frame through the head 32 andsleeve 34a ot' the casing 34 and carries the worm 37 which meshes with'the worm gear 36 as shown in Fig. 1, The shaft 33 is `supported at oneend in bearings 39, provided in a hollow boss 39 carried by the rearwall of the supplemental frame section 2" and at its opposite end inbearings 40 provided in a housing 41. The housing 41 comprises a hollowsection 42 and a cup member 43, hav ing atubular extension 44 whichforms one bearing for the shaft 12". lThe section 42 and cup member 43are providedfwith open ends closed by removable plates 45, 46,respectively. The section 42 and cup member 43 are preferably formedintegrally with each other and with a bracket or arm 47, by means ofwhich the housing 41 is rigidly supported on the columnl", the latterhaving an extended portion 1" (see Fig. 3) for this purpose.

48, 49 indicate change gears in mesh with each other, preferably a wormand worm gear, the former being removably connected to the shat't 33 andthe latter being removably connected to the shaft l2". Access to thechange gears'a48, 49, is permitted by the removable plates 45, 46.

50, 51, indicate loose and `fast pulleys, respectively, 'for a suitabledrive belt (not shown). The pulley 51 is secured to the shaft 33 in anydesired manner.

52 indicates a suitable belt shifter, preferably coinprising an cndwisemovable rod 52a, carrying a pair o-lateralarms 52" adapted to engage thebelt and shift it in a well-known manner. yl`he rear end of the rod 52is mounted in an opening formed in a lug 53 formed integrally on top ofthe supplemental :trame section 2a; the other end of the rod is slidablymounted in an openingl formed inthe the free end of an arm 54,preferably :formed integrally with and extending upwardly from thehousing 41.

It will now be apparent from the foregoing description that when thebelt is shifted to the 'fast pulley 51 lthe worms 37 and 48 on the shaft33 will-bev turned: the worm 37 connecting through the worm Wheel 36will drive the tool s )indle 2" and tool B; the worin 48 connectingthrough the worin Wheel 49 Will drive the shaft 12, pinion 12, gear 10,work spindle 7 and lWork piece A.

It will also be seen vthat the driving mechanism for the tool spindle 2and work spindle 7 is very simple in that the tool spindle is directlygeared to the power shaft 33 and that the work spindle is also geared tothe same power shaft throughl a single pair of reduction gears and asingle pair of change gears. Furthermore, this construction in which thedrive sha-ft 33 is 'arranged at a right angle with the shaft-12 permitsme to utilize a worm and worm gear 48 and 49 for the change gearsbetween the directly connected power shafts 33and 12a to change thespeed ratio between them easily and through a. very wide range ofratios.

` In my construction. either of the 'power shafts 33, 12,` may beconnected with the source of power-the fast pulley; but by preference, Ihave shown such pulley on the shaft 33 so that the movement of theslidel for the work-piece carrying .shaft may be effected 1n a simplemanner. Inr the form of construction shown, thepower shafts 33,'

12a, are arrangedat right angles to each other, this arrangementpermitting thc use of simple driving connections between them.

The worm 37 is splined to the shaft 33, this arrangement being necessaryto permit the slide 30 to he moved or adjusted on the ways 30n to feedthe tool to the work-,piece A, without affecting the driving connections(worm 37 j andworm gear 36) lbetween the power shaft 3 3 and cuttercarrying shaft 2. The slide 30 may be movedby a hand oper'- ated means.

k56 indicates as an entirety means for 'driving a nut 57, which engagesthe feed screw 27. to move the slide 5 in either direction.

The nut 57 comprises a sleeve having screw threads on its inner end andmounted to rotate in a suitable bearing` 57a. provided in the framesection 1 (see Fig. 6). 58 `indicatesa bevel gear, the hub of which iskeyed on the sleevenut 57. 59 indicates a thrust bearing betweenthe'rcar face of the bevel gear 58 and wall of the frame forming thebearing for the sleeve;r The end of the-sleeve adjacent to the ygear 58has a flange 58a to engage the outer end of the gear andl cooperateswith nut 60, screwed on theopposite end ofth sleeve to prevent endwisemovement of the nut 57 in either direction in its bearing 57, Due to thefact that thc nut 57 is held against endwise movement. its rotation willcause endwise movement of the feed screw, which in turn will move theslide 5 in its guides.

Of the driving means 56, 61 indicates a shaft having a bevelgear 62fixed to its outer end and meshing with the gear '58. The outer end ofthe shaft 61 is mounted in an arm'61a which is provided on a casing 61bio be later referred to. The arm 61 isbored to receive the shaft 61, asshown in Fig. 5. The bore of the arm 61 is provided with one or morebearings 61c (see Fig. 5) for the cuter end of the shaft. The inner'endof the opposite direction is prevented througlry the engagement of ashoulder 67 on the shaft engaging one end lof a clutch element 68,

loose on the shaft61 and engaging at its other end the inner end wall ofthe arm 61".

69 indicates a worm gear keyed to the clutch elementl 68, and arrangedto operate therethrough to rotate the shaft in one direction, when it isdriven in the manner about to be described. As will later appear, theshaft 61 is driven by separate driving connections, indicated as anentirety at 70, 71, to 'rotatel the shaft in one directionto move theslide 5 and work-piece thereon in the feeding direction or to rotate itin the opposite direction to return the slide and work-piece to startingposition. The power for operating the separate drive connections 70, 7l,is preferably .derived from the shaft 33, for which purpose a belt ulley'72 is connected thereto or to the fast palle)7 5-1, so that when thelatter is operated either of the connections 70, 71, may be driven.

" The pulley 72 is arranged to drive abelt (not'shown) which runs arounda pulley 73 loose on the shaft 61. Inv order to accommodate certainelements of one of the driving connections (70), bearing sleeves 74:,74a, surround a lportion of the shaft 6'1, the former sleeveconstituting a race for an anti-friction roller bearing v75 -on whichthe loose pulley 73 rotates. 76, 77 indicate pulleys respectivelyconnected with the separate driving connect-ions 70, 71. -Thc pulleys76,77are arranged at either lside. of the loose pulley 73 iny positionto have shifted to them the belt driven by the pulley 72,l so thateither of driving connections l70, 71, may be readily operated. 7 8indicates as an entirety a belt shifting mechanism ('see Fig. 6)preferably constructed and arranged to shift the belt from the pulley 73to either pulley 76, 77, but .to' operate auto- -matically in theopposite direction when the slide 5 reaches the limit of its movement ineither direction. The belt shifting' pulley 76.' The other end oftheshaft is suitably cut to provide a worm 80. 81, 82,

indicate a pair of shafts each mounted in suitable bearings provided inthe side walls 80 and worm .gears 69 respectively (the latter beingalready referred to), whereby the power of the sleeve shaft 79 istransmitted through the elements 80, 81", 81, 81a, 82,

I 82,1821 and 69 to rotate the clutch element 68. From the foregoingdescription, it will be seen that I have provided power ltransmittingelements in which two reductions in speed and a change gear adjustmentare provided for, so that any desired speed for the shaft 61 and throughit the slide 5 can be obtained.- y

88 indicates a thrust bearing for the sleeve shaft 79, mounted between acollar 79l and the adjacent end wall of the dasing 61h. 84, 85, indicatethrust bearings provided for the shafts 81, 82, respectively. As shownin Fig. 6 the shafts '81, 82, are reduced to form shoulders which restagainst the bearings, and the latter `are seated against the inner side'Wall of the casing 611. .The opposite ends of the4 shafts 81. 82,project through the inner side wall of the casing 61b and carry nuts orcollars 86, suitably secured to the shafts, to prevent their movementoutwardly. The reinaining'elements of the driving connections comprisede'- vices which are movable to cause a driving or non-drivingdrelationship between the clutch element68 and shaft 61 accordingly, asthe belt is shifted on to the pulley 77 or from the pulley back on tothe pulley 73 or pulley 76. Referring to these devices, 87 indicates aclutch element slidably fitting the shaft 61 and movable thereon toengage and disengage the clutch element 68. The outer end of the clutchelement -87 is preferably flanged, as showniat 87a, to provide a su portfor a pair of pawls 88 the inner ens of which project into recesses ornotches 89 formed in a pair ofcombined key and thrust members, 90, toconnect the clutch element 87 thereto, so that when the thrust membersare moved in one direction, as will be later set forth, the clutchelement will be moved with them. The pawls'88 preferably 'comprise apair of inwardly extending lugs provided on a ring S82-bolted to theflange 87, as shown in Fig. 5. 91 indicates grooves formed in the shaft61 and extending longitudinally thereof to receive the thrust members 90and permit them to move endwise therein. The inner wall of the clutchelement 87 is formed with longitudinally extending grooves 92 whichreceive lthe outer edges of the thrust members, thereby serving as keysto' lock the clutch element 87 to the shaft 61, 'so that the power ofthe clutch member 87, when driven will be transmitted through the thrustmembers 90 to rotatethe shaft 61. 92a indicates a collar surrounding theshaft 61- andfixed thereto in any desired manner. 93 indicates a coiledspring interposed :between the collar 92n and the clutch element 87 orring 88n and' normally tending to move the clutch element 87 intoengagement with the clutch element 68, so that when the power is applied through the pulley 76, the powerv transmitting elements anddevices just described, the shaft 61 will be driven in that direction Iwhich will effect movement of the slide 5 to fee-'l the work-piece Arelative to the tool B.

The driving connections 71 for returning` the slide 5 and work-piece Ato the starting position are preferably of a character to insurerelativefquick movement of the slide,

for which purpose such connections are connected directly to the shaft61. Of these connections, 94 indicates a collar fitted to the shaft 61so'asto rotate thereon and keyed in any desired manner, as shown at 95,to the hub of pulley 77 so as to be driven thereby. 96 indicatesrecesses formed in and extending longitudinally of the inner wall of thecollar 94 and arranged to receive the combined key and thrust members90. whereby the latter `serve as a driving` connection between thecollar 94 and shaft 61. The recesses 96 have a width'greater than thewidth of the members and their opposite side walls are so arranged thatthe collar 94 may rotate on or move relative to the shaft 61 a shortdistance before the key members will engage the side walls of therecesses and thereby transmit the rotative power of the vcollar to theshaft 61. 97indicates a projection formed ony the end of the collar 94and fitting within recesses 98 formed in an annular member 99 slidablyfittingthe shaft 61 and formed with grooves 100 aligned with the grooves91 to receive the keys 90, Whereby the latter lock the annular memberand shaft together against relative rotative movements. The ,Walls ofthe projections 97 and recesses 98 therefor'are inclined so as tooperate as cams. 'Accordingly if the 'collar 94 is rotated on theshaft'61, it will be seen that the cam walls of the projections 97engaging vthe walls of the recesses 98 will co-act therewith to effectva sliding of the annular member 99 endwise of the shaft 61. As theadjacent ends of the thrust members. 90 are provided with shoulders 101which engage the end wall of the annular member e 99, it will be seenthat the movement of the latter endwise of the s'haft will impart acorresponding movement to the .keys 90,

which in turn, acting through the pawls 88,

temeva will move the clutch element 87 and release it from the clutchelement 68. rllhe rotation of the collar 94 on the shaft 61 is providedfor by making the recesses 96 for the key members 90 wider than thewidth of the latter, as already described, so that when the beltis movedon to the pulley 77, it first rotates the collar on the shaft 61 untilthe key members engage the remote side walls of the recesses, followingwhich the pulley, acting through the collar-94, will drive the shaft 61in adirection opposite to that when the driving connections areconnected to it. The rotative movement of the collar 94 on the shaft 61,determined by the Width of the recesses 96, vis sufficient to move theannular member and keys far enough to effect a disengagement of theclutch elements 68, 87, before the keys engage the side walls of therecesses and through them eifect or complete the driving connectionsfrom the pulley 77 to the shaft 61. Upon the shifting of the belt fromthe pulley 77 back to the loose pulley 73, the spring 93 will move theclutch element 87 yinto engagement with the clutch element 68 andthrough the former element move thekeys endwise; and the keys in turn,through ,the annular member 99 and its cam will rotate the collar 94 onthe shaft 61 vin the opposite direction, thereby restoring theseelements to normal position.

Of the belt shifting.mechanism 78, 102 indicates a belt engaging memberpreferably comprising a sleeve 102" having spaced arms 103 disposed atopposite sides of the belt so as toiengage `therewith to move it ineither direction (see Fig. 6). 104 indicates an operatingr ro'd to whichthe belt engaging member is secured in any desiredV manner. The rod 104is preferably mounted to move endwise in either direction so as to movethe belt from the pulley 73 to either pulley 76, 77. 'lhe rod 104 ismounted in suitable hearings in the frame. members and extends to apoint beyond the front of the frame, where it is provided with a handle105; 106 indicates a collar fixed to the rod 104 by `a set screw orother suitable device. 107 indicates springs coiled around the rod 104,each interposed between one side of the collar 106 and the adjacent wallof the frame l-see Fig. 6. The springs 107 acting on the collar 106serve to maintain the latter midway between the opposing walls -of thevframe, so that the belt engaging member 102 is held in its mid-position,that is, with the belt guided to the pulley 73.v Accordingly,

if the-rod 104 is vmoved endwise in either direction to shift the beltto the pulley 76 or 77, one of the springs 107 will be comcates a pairof notches formed in the rod 104. 109 indicates a lock and releasemember, preferably comprising a rod slidably mounted in a bearing 110formed in a plate 111, which is bolted on the side wall of the framesection la-see Fig. 2.r The rod 109 is preferably disposed at rightangles to the operating rod 104. The upper end of the rod 109 ispreferably provided-with cam surfaces 112 and these surfaces, when therod 109 is in its raisedI or normal position, are disposed in the pathof movement of a pair of spaced cams 113 and 113 carried by the slide"lhe lower end of the rod 109 may be provided with a foot-engagingmember 114 by means of which the operator, can conveniently move the roddownwardly when it is desired to release the rod 104 and to stop thedriving connections 70 or 71. The lower end of the wall for the bearing110 is enlarged to form a chamber 110a for a spring 115, preferablycoiled around the rod 109. One end of the spring bears against a hollowplug 116, screwed into the open end of the chamber 110, and the op-'posite end of the 'spring .engages a collar provided on the rod 109vand acts therethrough normally to push the rod upwardl to position thecani surfaces 112 in the patfi of movement of the cams 113, 1132. 117indcates a notch or cut-away portion formed in one' side of the rod 109,and arranged so as to permit the rod 104 to be moved end wisc when therod 109 is depressed or lowered. Below the notch 117 the rod is providedwith a lug 117a which enters one of the notches 108 when the rod 104 ismoved in either direction. By preference, the rod 104 is cut away toform an angle shaped recess the wall of'which slides on the lug '117a asthe rod is moved. vFigs 6 and 8, the rods 104, 109, are so posi- Asshown in tioned or supported that one intercepts the other, the purposebeing to effect the locking and releasing of the rod 104 bv the .rod109, as will be understood from the following description: Figs 6 and 8illustrate the rod 104 in normal position and disposed in the cut-awayportion 117. If now the rod 104 is moved endwise to bring one of thenotches 108 in alignment with the lug 117a on the rod 109, the latterwill be operated upwardly under the influence of the spring 115 to theposition shown in Fig. 2,` and by the engagement ofthe lug 117 with aside wall of the notch 108, will lock the rod 104 in operated posit-ionwith one of the springs 107 compressed.- As the notches 108 are spacedso that movement of the rod4 104, as 'ust described, will shift the beltto one o the pulleys 76, 77, it will be seen that the slide 5 will beput in operation, and as the work-piece A and tool B are driven incorrelation to each other through the shafts- 33 and 12a, it will beseen that the ing that the belt has been shifted to the seen that I haveprovided relatively simple,v

pulley 76, the drive connections Z0 Will be operated and the slide 5moved in the feeding direction or toward the right as shown in Fig. 2.As the end of this movement is approached, the cam 113 engages the adjacent cam surface 112 and pushes the rod 109 downwardly, against thetension of the spring 115, which movement Will bring the notch 117 intoalignment with the rod 1011 and permit its endvvise movement under theinfiuence of the spring 107. By operating the rod 104 to its otherposition, to shift the belt to the pulley 77, the slide 5 will bereurned to starting position, at which time or as it approaches suchposition, the cam 113a will operate the rod 109 and release the rod 104in the manner already described.

From the foregoing description, it Will be means for setting the slide 5in operation and for automatically stopping it at the end of itsmovement in either direction.

118 indicates a casing or housing for the change gears 82, 81a. Thecasing 118 comrises a pair of members 1188, 118D, the ormer beingsecured to the frame member by cap screws 119 and the latter beingremovablyV secured to the casing member 118a by a pair of devices 120.

121 indicates a shaft mount-ed in a sleeve 122. The sleeve 122 isprovided With a flange 122, which is secured in any desired manner tothe frame member la-see Fig. 2. The sleeve 122 is mounted in an opening123 formed in the frame member 1a. '124 inolicates a bushing for theshaft fixed in the sleeve in any desired manner. The inner end of theshaft 121 is reduced to form a shoulder 125 against' which a bevelpinion 126 is seated. The pinion is held in'position on the inner end ofthe shaft by a nut 12?.

The pinion 126 meshes with the pinion 58 and is arranged to drive thelatter when the shaft 121 is rotated. The outer end of the shaft 121 issquared or otherwise shaped to receive a crank (not shown) by means ofwhich the shaft is rotated, thus providing a means for moving the slide5 by`hand, when desired. 127, 127", indicate a pair of collars or ringsmounted on the shaft 121 and forming abutments for a spring 128 coiledaround the shaft 121. The outer ring 127 is slidable on the shaft sothat it may be engaged by the crank and moved ,inwardly against thetension of the spring 128 when the crank is positioned on the squaredend of the shaft. So long as the cranlr is held by the operative, on thesquared por tion of the shaft, the ring 127n will be held againstmovement outwardly, but upon release of the crank by the operative, thespring 128, acting through the ring 127, will slide or push the crankoff the outer Leraars' end of the shaft 121. To prevent the ring 127afrom. being pushed. by the spring 128 out of the sleeve 122, the outerend thereof is provided with an inwardly extending flange 129, Whichforms a stop for the ring.

The slide 30 is moved into cutting position and then out of engagementwith the Work by any suitable means, but preferably by means of a feedscrew (not shown) operated by a crank Wheel 130, the operations of Whichare controlled by a rod 131 fixed to the side 30a and a lug 132 fixed tothe rim of the Wheel 130. x

133 indicates a Wheel or pulley fixed to an extended end of the shaft 33and driving a belt (not shown) which runs around a pulley 134 fixed tothe shaft 135. The shaft 135 is mounted in a bracket 136 and is gearedor connected to a pu1np,vindicated generally at 137, having a supplypipe 138 and a dey each other-preferably at right angles, whicharrangement admits of the use of worm ears. As access to these gears isprovided for, they may be removably connected to their respectiveshafts. As a result.. they may be readily removed and others substitutedto change'the ratio of rotationof one shaft relative to the other. Itwill also be seen that the tool spindle is mounted to swing about theaxis of one of these shafts so that it may be adjusted in a plane thatis parallel to the Work carry spindle to any desired angle according tothe character of the Work to be cut.

To those skilled in the ar't to which my invention relates, manyalterations in construction and Widely differing embodiments andapplications of theinvention will suggest themselves without departingfrom the spirit and scope-thereof. My disclosures and t e 'descriptionherein are purely illustrative les llfl

and are not intended to be in any sense liniiting.'

'.WhatI claim is:..A

1. Ina bobbing machine. a drive shaft connected to a. source of power, atool spindle.` a driven gear on the. tool spindle and a driving gear onthe drive shaft meshtherewith to' drive the tool spindle, a supple'mental shaft, a driven gear on the supplemental shaft, and a seconddriving gea-r on the drive shaft meshing therewith t'o drive thesupplemental shaft, a. work spindle, a driven gear on the work spindle,a driving gear on the supplemental shaft meshing therewith to drive thework spindle, the tool spindle being adjustable toward the work spindlein a direction parallel tothe drive shaft shaft.

3. In a hobbing machine. a drive connected with a source of power, atool spindle, a driven gear on the tool spindle and a driving gear onthe drive shaft meshing therewithsto drive the `tool spindle, a

' supplemental shaft at substantially a right angle to the drive shaft,a driven geary on the supplemental shaft and a second driving gear onthe drive shaft meshing therewithL to drive the supplemental shaft, awork spindle parallel to the supplemental shaft, a driven gear onthepwork spindle and a driving gear on the supplemental shaft Ameshingtherewith to drive the work spindle, the tool spindle being adjustablearound the axis of the drive shaft in a plane parallel to the axis ofthe work spindle.

y 4. In a hobbing machine. a drive shaft connected with a source ofpower, la tool spindle, a driven .gear on the tool spindle and -adrivingl gear on the drive 'shaft meshing therewith to drive the toolspindle, a supplemental shaft at substantially a right angle to thedrive shaft, a driven gear on the supplemental shaft and a seconddriving gear on the drive .shaft meshing therewith to drive thesupplemental shaft, a work spindle parallel to the supplemental shaft, adriven gear on the work spindle and a driving gear on the supplementalshaft meshing therewith to drive the work spindle, the tool spindlebeing adjustable toward the work spindle in a direction parallel to thedrive shaft. Y

5. In a bobbing machine, a drive shaft connected with a source of power,a tool spindle, a driven gear on the tool spindle and a driving gear onthe drive shaft meshing therewith to drive the tool spindle, a

` supplemental shaftjat substantially a right angle to the drive shaft,a driven gear on the supplemental shaft and a second driving gear on thedrive shaft meshing therewith to drive the supplemental shafta workspindle parallel to the supplemental shaft, a'driven gear on `the -workspindle and a driving gear on the supplemental shaft meshing therewithto drive the work spindle, the said second driving gear on the driveshaft and the drivenI gear on the supplemental shaft being change gearsand respectivelyjaworm, and worm gear. I

6. In a hobbing machine, a drive shaft connected with a source. ofpower, a tool spindle, a' driven gear on the tool spindle, a drivinggear on the drive shaft meshing therewith to drive lthe tool spindle, asupplemental shaft at substantially a right angle i to the drive shaft,a driven gear on the supplemental shaft and a second driving gear on thedrive shaft meshing therewith to drive the supplemental shaft,'a workspindle parallel to the supplemental shaft, a driven gear on the workspindle and a driving gear on the supplemental shaft meshing therewithto drive the work spindle, atool on the 4tool spindle, a work piece onthe work spindle, and `means for moving the work spindle longitudinallyto cause the workpiece and work tool to engage each other.

7. In ahobbing machine,a drive shaft connected with a' source of power,a tool spindle` a driven gear on the tool spindle and a driving gear onthe drive shaft meshing therewith to drive the tool spindle,A asupplemental shaft at substantially a right angle to the-drive shaft, adrivengear on the supplemental shaft and "a second driving gear on thedrive shaft meshing therewith -to drive the supplemental shaft,l a workspindle parallel to the4 supplemental shaft, a driven gear on the workspindle and a driving gear on theJ supplemental 'shaft meshingtherewithto drive the work spindle, a. tool on the tool spindle, a workpiece on the work spindle, means .for moving the work spindlelongitudinally yto cause the work piece and tool to engage each other,the relative positions of the tool and work piece being adjustable byadjusting the-,tool spindle around the axis of the drive shaft.

8. In a bobbing machine, a drive shaft connected with a source Aofpower, a tool spindle, a driven gear on the tool spindle and a drivinggear on the drive shaft meshing therewith to drive the vtool spindle, asupplemental shaft at substantially a right angle to the drive shaft, adriven gear on the supplemental shaft and a second driving gear on thedrive shaft meshing therewith todrive the supplemental shaft, a work'spindle parallel to the supplemental shaft, a driven gear. on the worklspindle and a driving gear on the supplemental shaftmeshing therewithto -drive the work spindle, va tool on the tool spindle, a work piece onthe work spindle, means for moving the work spindle longitudinally tocause the work pieceand tool to engage eachother, the

relative positions of the tool and work piece -cluding a second drivin awork spindle at substantially a right-angle to dthe drive shaft, drivingconnections ingear onthe drlve shaft whereby 'the wor spindle is drivenfrom the drive shaft, 'the tool spindle beingV adjustable around theaxis of the drive shaft in aplane parallel to `the axis ofv 'the workspindle.

10. In ahobbing machine, a drive shaft, a tool spindle. a driven gear onthe tool spindle and a driving ear on the drive shaft meshing. therewithto drive the tool-spindle,

la supplemental shaft, a driven gear on the` supplemental shaft and asecond driving gear on the drive shaft` meshing .therewith to drive thesupplemental shaft, a work spindle, driving connections between the supjplemental shaft and the work spindle' for driving the work spindle, thetool spindle being adjustable around the axis of the drive shaft in aplane parallel tothe axis of the workspindle.

11. In ahobbing machine, adriveI shaft, al

tool spindle, a driven gear on the tool s indle and a driving gear'onthe drive-s aft meshing therewith to drive the tool spindle, asupplemental shaft, a driven gear on the supplemental shaft, and asecond driving gear on the drive' shaftfm'eshing therewith to drive thesup lemental. shaft, a work spindle at substantie ly a rightl angle tothe drive shaft, driving connections be tweenwthe supplemental shaft andthe work spindle, the. tool s indle being adjustable around the axis oftiie drive shaft in a plane parallel to the axis of the work spindle.

v12. In a bobbing machine, a drive shaft,`a

tool spindle, a` driven gear ori/the tool spindie and a driving gear onthe drive shaft Ameshin therewithto drive the ltool spindle, 'a su\pemental shaft, adriven gear on the supp emental shaft and a seconddriving gear on the drive shaft meshing'therewith to drive thesupplemental shaft, a lwork spin'- dle substantially parallel to thesupplemental shaft and substantially at a right angle to the driveshaft, a driven gear on the work spindle and a driving gear `on the'supple-` mental shaft meshing therewith to drive the work s iindle.

13. In al tool spindle, a driven gear on the tool 's )indle and adriving gear on the drive s aft meshing therewith tol drive the vtoolspindle, a work spindle at substantially al right angle to the driveshaft, driving connections includino' a second driving gear on the driveshaft. whereby the work spindle is driven 1obbing.machine,a drive shaft,a-

from the drive shaft, the 'tool spindle being adjustable around-the axisof the drive shaft ina plane parallelto the axis ofthe work spindle andadjustable toward and from the work spindle in a direction parallel tothe drive shaft.

14. In a bobbing machine, a drive shaft, a tool spindle, a worm gear onthe tool spindle and a worm on the drive shaft meshing therewith todrive the vtool spindle, a supplemental shaft, a worm `wheel on thesupplemental shaft and a second worm on the drive shaft meshingtherewith t0 drive 'the supplemental shaft, a work' spindle, connectionsbetween the supplemental shaft and the work spindle to drive the workspindle, the tool spindle being adjustable around the axis of the driveshaft in a plane parallel to the axis ofthe work spindle.

15. In a hobbing machine, a drive shaft, a tool spindle, a worm gear onthe tool spindle and a worm on the drive shaft meshing therewith todrive the tool spindle,.a supplemental shaft, a worm gear'on vthe'supplemental shaft and a second rworm on the drive shaft meshingtherewith to drive the supplemental shaft, a work spindle substantiallyparallel to the supplemental shaft and substantially at a right anglevtothe drive shaft, a gearonthe work spindle andva gear on the supplementalshaft meshing therewith t0 drive the Work spindle.

16. In a hobbingmachine, a drive shaft, a tool spindle, a driven gear onthe tool spindle and a driving gearfon the drive shaftmeshing therewithto drive the tool spindle, a work'spindle at substantially a right angleto the drive shaft, driving connections whereby the work spindle isdriven from the drive shaft, the tool spindle being adjustable aroundthe axis of the drive shaft in a plane parallel to the axis of the workspindle, the

.tool spindle beingI adjustable toward and from the work spindle in adirection parallel to the drive shaft, and the work s indle beingmovable in thedirection o relatively to the tool spindlewith a feedingmovement.

17 In a hobbing machine, a drive shaft, a tool spindle, a worm gear onthe tool spindle and a irst'worm on the drive shaft meshing'.

therewith to .drive the ytool spindle, a work 'spindle at substantiallya right angle to the drive shaft. driving connections including a'second worin on the drive shaft wherebv the work spindle is driven fromthe drive shaft, the tool spindle being adjustable around the axis'ofthe drive shaft in a plane parallel to the axis of the work spindle, andthe worm Wheel being correspondingly adjustable on 'the firstworm'around the said axis and in engagement therewith at all-adjustedpositions. In testimony whereof, lI have. hereunto subscribed my name.

CHARLES H. SCHURR.

its axis

